Add method to notify blink when PeerConnection is closed in Chrome

Source/modules/mediastream/RTCPeerConnection.cpp

Index: Source/modules/mediastream/RTCPeerConnection.cpp
diff --git a/Source/modules/mediastream/RTCPeerConnection.cpp b/Source/modules/mediastream/RTCPeerConnection.cpp
index 8a5689db7282f8608f3bae817cf070b23823db42..e9686fb1665cae6b23d27e9296917f6d5a5d8bff 100644
--- a/Source/modules/mediastream/RTCPeerConnection.cpp
+++ b/Source/modules/mediastream/RTCPeerConnection.cpp
@@ -606,12 +606,7 @@ void RTCPeerConnection::close(ExceptionState& exceptionState)
     if (throwExceptionIfSignalingStateClosed(m_signalingState, exceptionState))
         return;
 
-    m_peerHandler->stop();
-    m_closed = true;
-
-    changeIceConnectionState(ICEConnectionStateClosed);
-    changeIceGatheringState(ICEGatheringStateComplete);
-    changeSignalingState(SignalingStateClosed);
+    closeInternal();
 }
 
 void RTCPeerConnection::negotiationNeeded()
@@ -707,6 +702,12 @@ void RTCPeerConnection::releasePeerConnectionHandler()
     stop();
 }
 
+void RTCPeerConnection::closePeerConnection()
+{
+    ASSERT(m_signalingState != RTCPeerConnection::SignalingStateClosed);
+    closeInternal();
+}
+
 const AtomicString& RTCPeerConnection::interfaceName() const
 {
     return EventTargetNames::RTCPeerConnection;
@@ -767,6 +768,17 @@ void RTCPeerConnection::changeIceConnectionState(ICEConnectionState iceConnectio
     }
 }
 
+void RTCPeerConnection::closeInternal()
+{
+    ASSERT(m_signalingState != RTCPeerConnection::SignalingStateClosed);
+    m_peerHandler->stop();
+    m_closed = true;
+
+    changeIceConnectionState(ICEConnectionStateClosed);
+    changeIceGatheringState(ICEGatheringStateComplete);
+    changeSignalingState(SignalingStateClosed);
+}
+
 void RTCPeerConnection::scheduleDispatchEvent(PassRefPtrWillBeRawPtr<Event> event)
 {
     m_scheduledEvents.append(event);